Crystalline Solids vs Amorphous Solids
Class 12 - Chemistry - Chapter 1 - Solid State
| Crystalline Solids | Amorphous Solids |
|---|---|
| 1. They have definite and regular geometry due to definite and orderly arrangement of atoms, ions or molecules in three dimensional space. | 1. They do not have any pattern of arrangement of atoms, ions or molecules and thus, do not have any definite geometrical shape. |
| 2. They have sharp melting points and change abruptly into liquids. | 2. Amorphous solids do not have sharp melting points and do not change abruptly into liquids. |
| 3. Crystalline solids are anisotropic. Some of their physical properties are different in different directions. | 3. Amorphous solids are isotropic. Their physical properties are same in all directions. |
| 4. These are considered as true solids. | 4. These are considered pseudo solids or supercooled liquids. |
| 5. Crystalline solids are rigid and their shape is not distorted by mild distoring forces. | 5. Amorphous solids are not very rigid. These can be distorted by bending or compressing forces. |
| 6. Crystals are bound by plane faces. The angle between any two faces is called interfacial angle. For a given crystalline solid, it is definite angle and remains always constant no matter how the faces develop. When a crystalline solid is hammered, it breaks up into smaller crystals of the same geometrical shape. | 6. Amorphous solids do not have well defined planes. When an amorphous solid is broken, the surfaces of the broken pieces are generally not flat and intersect at random angles. |
| 7. Crystals have some sort of symmetry. (i) plane of symmetry, (ii) axis of symmetry or (iii) centre of symmetry | 7. Amorphous solids do not have any symmetry. |
| 8. Copper Sulphate (CuSO₄), NiSO₄, Diamond, Graphite, NaCl, Sugar etc. | 8. Coal, Coke, Glass, Plastic, rubber etc. |
Comments
Post a Comment